+Stephanophorus leucocephalus+, _Scl. et Salv. Nomencl._ p. 20; _Durnford, Ibis_, 1877, p. 170 (Buenos Ayres); _White, P. Z. S._ 1882, p. 597 (Misiones); _Barrows, Bull. Nutt. Orn. Cl._ viii. p. 90 (Concepcion); _Scl. Cat. B._ xi. p. 143. +Stephanophorus cœruleus+, _Burm. La-Plata Reise_, ii. p. 480 (Paraná). _Description._--Uniform deep blue; cap silky white, with a small crimson crest; bill brownish black, feet brown: whole length 7 inches, wing 4, tail 3·3. _Female_ similar, but not quite so bright in colour. _Hab._ Southern Brazil, Paraguay, and Northern Argentina. Azara gave the generic name _Lindo_ (beautiful) to the Tanagers, and this species he named the "Blue White-headed Beautiful," the entire plumage being of a very lovely deep corn-flower blue, except a cap of silvery-white feathers on the head, with a crimson spot on the forehead, looking like a drop of blood. It is a summer bird in Buenos Ayres, where it makes its appearance in spring in the woods bordering on the Plata river, and is usually seen singly or in pairs. The nest is built in a tree ten or twelve feet from the ground, and is somewhat shallow and lined with soft dry grass. The female lays four eggs, white and spotted with deep red. During incubation the male sits concealed in the thick foliage close by, amusing itself by the hour with singing, its performance consisting of chattering disconnected notes uttered in so low a tone as to make one fancy that the bird is merely trying to recall some melody it has forgotten, or endeavouring to construct a new one by jerking out a variety of sounds at random. The bird never gets beyond this unsatisfactory stage, however, and must be admired for its exquisite beauty alone. 37. TANAGRA SAYACA, Linn. (BLUE TANAGER.) +Tanagra cyanoptera+, _Durnford, Ibis_, 1878, p. 59 (Buenos Ayres); _Barrows, Bull. Nutt. Orn. Cl._ viii. p. 91 (Concepcion); _Scl. Cat. B._ xi. p. 157 (part.). +Tanagra sayaca+, _Burm. La-Plata Reise_, ii. p. 479 (Paraná); _Berl. Zeitschr. ges. Orn._ 1885, p. 119, _Scl. Cat. B._ xi. p. 158. _Description._--Bluish grey, paler below; wings and tail blackish, edged with greenish blue; lesser wing-coverts dull greenish blue, like the edgings of the wings; bill plumbeous, feet brown: whole length 6·0 inches, wing 3·6, tail 2·7. _Female_ similar. _Hab._ S.E. Brazil and Argentina. In the 'Catalogue of Birds' I referred the Argentine Blue Tanager to _T. cyanoptera_, though expressing a doubt upon the subject. I am now disposed to adopt Graf. v. Berlepsch's view that the Argentine species rather belongs to _T. sayaca_.--P. L. S. This species migrates as far south as Buenos Ayres, and appears in spring, in small flocks or parties of three or four birds, in the woods on the shores of the Plata. The male utters a series of peculiar squealing notes by way of song. 38. TANAGRA BONARIENSIS (Gm.). (BLUE-AND-YELLOW TANAGER.)